Hot air furnace



Mar. 27, 1923.

F. M. WELCH ET AL.

HOT AIR FURNACE.y

man MAY 13. |922.

2 SHEETS-SHEET lomda /f/ ...M www@ Mar. 27, 1923. 1,449,712. F. M. WELCH `ET AL.

HOT AIR FURNACE.

FILED MAY 13, 1922. 2 SHEETS-SHEET 2 Patented Mar. 27, 1923. y

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* Veinem@n.walten, reeseerwrrrmreee,nimmst@ To all whom' tmay concern.'

. l-Be it known that'fwe',`FRANK"fM.z

Fand THnoDoRE Pnnscorrna citizens :iofafzt'he i United States,Y residingl at Pillager, "'iniithe@ county of Cass and State-of"Minnesota,fhave invented new and useful Improvements in Hot-Air Furnaces, vof which the following is a specification. f

. ecapacity of facilitating? the passage ffoffthot .ii

air' from theffurnace withv al viewfto'promoting the heatingof abuilding..k I To the attainmentzof-y he foregoing7 invention 'consists in the` improvementvlas hereinafter describedV and denitelyclaim'd.

In the accompanying drawings, forming part of this applicationv Y Figure 1 is a frontnelevation of thefffu'rfnace constituting the `:best.practical embodi-V ment' ofour -inventionthat we have as yet devised.

Figure 2 is a side elevation of the same.

' Figure 3 is a vertical cross-section taken in the plane indicated by the line 3-3 of Figure 2.

Figure 4 is a horizontal section taken in the plane indicated by the vline 4 4 of FigureV 1.

Similar numerals of reference designate corresponding parts in all of the views of the drawings.

In furtherance of our invention the furnace casing 1 is made of considerable thickness of brick or other refractory and insulating material.

The said casing 1 is characterized by upper dead'air spaces 2 to increase its insulating capacity, and is also characterized by openings 3 arranged in the base of the side walls of the casing and designed to admit cold air to the interior of the casing. The casing 1 is further characterized by a top wall, the inner side of which is arcuate transversely of the furnace as indicated by 4 for an important purpose hereinafter set forth.

Within the casing 1 is arranged a fire box 5 of cast iron or other appropriate conductive material, to the rear upper portion of which is connected an-uptake 6. The said re box 5 is provided in tsfforward perf.

,'re'fffsandftf l the uref-whereby v and''will "be`| highly. heatedby ate "7,1 thereby gvingoff finned w' had which-is disposed within onta-mngthe nlrnaceiQ-At 15 @anni a fixed segmental rack 18. 1n virtue of this construction it will be observed that ythe valve 15..,can be placed in various positions in v.the arcvindicated by. dotted lines and arrows in Figure 4. kFor instance,V when the valve l5 is positionedas shown in Figure 4 air from within the building will be led into'the pipe 11 to be supplied to the interior of the casingl. When the valve 15 is located to close the opening 14 airwill be permitted to enter the casing 1 from a point outside the building containing the furnace, while when the valve 15 is positioned against the side of the pipe 13 air from the opening 14. and `also from the pipe 13 will be permitted toenter the casing 1. From this it etrangere in tha-grate :dream follows that the person in charge of the fury nace can regulate the air supply tothe cas ing -1 vaccording t/o the weather conditions that prevail.

At 19 and 20 are face plates appropriately exea to the front M1121 of the Casing 1, a Y

being understood in this connection that the ,frontk wall 21 and the back wa1l'22 of the casing 1 are formedof appropriate non-conducting material such as fbrick. The face plate '19 carries a fire door 23 on which is described.` .v ,y I d i Leading at different points frommthe ar-4 cuate top of the interior ofthe casingl are hot air pipes'27 which according to our invention and need not, therefore.be further vention are disposed radially with respect ment. understood as conining ourselves to the said to the circle described in part the said transverse arcuate Wall-4. Thisarrange:l

ment of the pipes 27 is materially advantageous inasmuch as it conduces tothe free passage of'hot air from the interior of they casing l to the apartments thatfare to be heated by the hot air supplied lthrough the said pipes 27, and in ,view 'oi-theareuate- Wall, the hot air pipes -27 are'located in a position substantially vertically above-the fire box forevenly distributing` the heated air from thelire box to the differentpip'es.

' It Will be readilyl apparent from the oregoing that due to the insulating qualitysof Y the casing l, airs entering and passing throughthe casing Will 'be-heated to an appreciable extentffor a consderableperiod of time after the lirev in the re boxI zhas gone out. It W'illfalso be' appreciated owing to the insulating quality ofthe :'casingf l' and rthe arrangement of the pipes for; supplying air to the interior of the casingll and-the pipes for conducting hot air from the casing l, a small fire in the rebox 5 Willsuiiice to adequately heat the apartmentsfin; connection. with `the pipes27l of which any rea` sonable number may be employed Ain proportion to the size of the furnace as avv/hole.

,llVe have.; entered `into a detailed description of Lthefconstruction and relative arrangement of the parts embraced in the ,presentl andepreferred embodiment of our specific construction and relative arrangement of partsinasmuch as in the future practice of the invention various changes and modifications may be made such as -fall Within the scope of our invention asdefined in our appended claim.

In al hot air furnace, the combination of a casing, means to conduct hot air fromwthefl top ofthe interior of said casing, meansto .supply air to be heatedto the interior thereofyand a fire box located in the casing and yspaced from the side and back Wallsthereof andfhaving a grate in its forward portionfl.

andalso having a pit adapted to be filled With dirt or sand in. its rear portion,4 Whereby this dirt or sand will be highly heated by the fire in the iire box, thereby giving off this heat when the fire in the box hasfdied# vout.

In testimony whereof, Wel ailix our signatures.l .v 1 FRANK M. WELCH.

THEODORE PRESCVOTT.h i. 

